微信小程序 侧滑删除（左滑删除）

微信小程序 侧滑删除（左滑删除）

如图所示，demo是小程序的侧滑删除，这个是我在别人写的例子的基础上修改的。代码如下

js文件代码：

// pages/leftSwiperDel/index.js 

var initdata = function (that) {
 var list = that.data.list
 for (var i = 0; i < list.length; i++) {
  list[i].txtStyle = ""
 }
 that.setData({ list: list })
} 

Page({
 data: {
  delBtnWidth: 180,//删除按钮宽度单位（rpx）
  list: [
   {
    txtStyle: "",
    icon: "/images/qcm.png",
    txt: "指尖快递"
   },
   {
    txtStyle: "",
    icon: "/images/qcm.png",
    txt: "指尖快递"
   },
   {
    txtStyle: "",
    icon: "/images/qcm.png",
    txt: "指尖快递"
   },
   {
    txtStyle: "",
    icon: "/images/qcm.png",
    txt: "指尖快递"
   },
   {
    txtStyle: "",
    icon: "/images/qcm.png",
    txt: "指尖快递"
   },
   {
    txtStyle: "",
    icon: "/images/qcm.png",
    txt: "指尖快递"
   },
   {
    txtStyle: "",
    icon: "/images/qcm.png",
    txt: "指尖快递"
   },
   {
    txtStyle: "",
    icon: "/images/qcm.png",
    txt: "指尖快递"
   },
   {
    txtStyle: "",
    icon: "/images/qcm.png",
    txt: "指尖快递"
   },
   {
    txtStyle: "",
    icon: "/images/qcm.png",
    txt: "指尖快递"
   },
   {
    txtStyle: "",
    icon: "/images/qcm.png",
    txt: "指尖快递"
   }, 

  ]
 },
 onLoad: function (options) {
  // 页面初始化 options为页面跳转所带来的参数
  this.initEleWidth();
 },
 onReady: function () {
  // 页面渲染完成
 },
 onShow: function () {
  // 页面显示
 },
 onHide: function () {
  // 页面隐藏
 },
 onUnload: function () {
  // 页面关闭
 },
 touchS: function (e) {
  if (e.touches.length == 1) {
   this.setData({
    //设置触摸起始点水平方向位置
    startX: e.touches[0].clientX
   });
  }
 },
 touchM: function (e) {
  var that = this
  initdata(that)
  if (e.touches.length == 1) {
   //手指移动时水平方向位置
   var moveX = e.touches[0].clientX;
   //手指起始点位置与移动期间的差值
   var disX = this.data.startX - moveX;
   var delBtnWidth = this.data.delBtnWidth;
   var txtStyle = "";
   if (disX == 0 || disX < 0) {//如果移动距离小于等于0，文本层位置不变
    txtStyle = "left:0px";
   } else if (disX > 0) {//移动距离大于0，文本层left值等于手指移动距离
    txtStyle = "left:-" + disX + "px";
    if (disX >= delBtnWidth) {
     //控制手指移动距离最大值为删除按钮的宽度
     txtStyle = "left:-" + delBtnWidth + "px";
    }
   }
   //获取手指触摸的是哪一项
   var index = e.target.dataset.index;
   var list = this.data.list;
   list[index].txtStyle = txtStyle;
   //更新列表的状态
   this.setData({
    list: list
   });
  }
 }, 

 touchE: function (e) {
  if (e.changedTouches.length == 1) {
   //手指移动结束后水平位置
   var endX = e.changedTouches[0].clientX;
   //触摸开始与结束，手指移动的距离
   var disX = this.data.startX - endX;
   var delBtnWidth = this.data.delBtnWidth;
   //如果距离小于删除按钮的1/2，不显示删除按钮
   var txtStyle = disX > delBtnWidth / 2 ? "left:-" + delBtnWidth + "px" : "left:0px";
   //获取手指触摸的是哪一项
   var index = e.target.dataset.index;
   var list = this.data.list;
   list[index].txtStyle = txtStyle;
   //更新列表的状态
   this.setData({
    list: list
   });
  }
 },
 //获取元素自适应后的实际宽度
 getEleWidth: function (w) {
  var real = 0;
  try {
   var res = wx.getSystemInfoSync().windowWidth;
   var scale = (750 / 2) / (w / 2);//以宽度750px设计稿做宽度的自适应
   // console.log(scale);
   real = Math.floor(res / scale);
   return real;
  } catch (e) {
   return false;
   // Do something when catch error
  }
 },
 initEleWidth: function () {
  var delBtnWidth = this.getEleWidth(this.data.delBtnWidth);
  this.setData({
   delBtnWidth: delBtnWidth
  });
 },
 //点击删除按钮事件
 delItem: function (e) {
  var that = this
  wx.showModal({
   title: '提示',
   content: '是否删除？',
   success: function (res) {
    if (res.confirm) {
     //获取列表中要删除项的下标
     var index = e.target.dataset.index;
     var list = that.data.list;
     //移除列表中下标为index的项
     list.splice(index, 1);
     //更新列表的状态
     that.setData({
      list: list
     });
    } else {
     initdata(that)
    }
   }
  }) 

 } 

})

wxss文件代码：

/* pages/leftSwiperDel/index.wxss */
view{
  box-sizing: border-box;
}
.item-box{
  width: 700rpx;
  margin: 0 auto;
  padding:40rpx 0;
}
.items{
  width: 100%;
}
.item{
  position: relative;
  border-top: 2rpx solid #eee;
  height: 120rpx;
  line-height: 120rpx;
  overflow: hidden;
}
.item:last-child{
  border-bottom: 2rpx solid #eee;
}
.inner{
  position: absolute;
  top:0;
}
.inner.txt{
  background-color: #fff;
  width: 100%;
  z-index: 5;
  padding:0 10rpx;
  transition: left 0.2s ease-in-out;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.inner.del{
  background-color: #e64340;
  width: 180rpx;text-align: center;
  z-index: 4;
  right: 0;
  color: #fff
}
.item-icon{
  width: 64rpx;
  vertical-align: middle;
  margin-right: 16rpx
}
.thumb{
  width: 200px;
  height: 200px;
  -webkit-overflow-scrolling: touch;
  overflow: scroll;
}

wxml文件代码：

<view class="item-box">
 <view class="items">
  <view wx:for="{{list}}" wx:key="{{index}}" class="item">
   <view bindtouchstart="touchS" bindtouchmove="touchM" bindtouchend="touchE" data-index="{{index}}" style="{{item.txtStyle}}" class="inner txt">
   <image class="item-icon" mode="widthFix" src="{{item.icon}}"></image>{{index}}{{item.txt}}</view>
   <view data-index="{{index}}" bindtap = "delItem" class="inner del">删除</view>
  </view>
 </view>
</view>

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